linkage prob...

linkage prob...

[Itay 'z9u2K' Duvdevani]

Hey,
I need an "extern static const" decleration, but it is forbidden...
at the moment, my app won't link...

summery:

decl.h:
namespace a
{
    namespace b
    {
        class x;
        // ...
    }
   
    using namespace b;
    // ...
}

*********

x.h:
#include "decl.h"
class a::b::x
{
public:
    // ...
    static const int q1;
};

**********

x .cpp:
#include "x.h"
const int a::b::x::q1 = 4;
// ...

********

main.cpp:
#include "decl.h"
#include "x.h"
#include <iostream>
using namespace a;

int main()
{
    std::cout << x::q1;        // will not link... g++ says:
    // main.cpp:8: undefined reference to `a::b::x::q1[in-charge](int 
const&)'
}

What am I doing wrong?
thanks...

Re: linkage prob...

[Andrea 'fwyzard' Bocci]

At 18.46 03/01/2003 +0200, Itay 'z9u2K' Duvdevani wrote:
>Hey,
>I need an "extern static const" decleration, but it is forbidden...
>at the moment, my app won't link...

No, you don't need it to be static...

The following works for me (RedHat 8.0, GCC 3.2) :
>decl.h:
>namespace a
>{
>    namespace b
>    {
>        class x;
>        // ...
>    }
>}
>
>*********
>
>x.h:
>#include "decl.h"
>class a::b::x
>{
>public:
>    // ...
>    static const int q1;
>};
>
>**********
>
>x .cpp:
>#include "x.h"
>const int a::b::x::q1 = 4;
>// ...
>
>********
>
>main.cpp:
>#include "decl.h"
>#include "x.h"
>#include <iostream>
>using namespace a;
>using namespace a::b;
>
>int main()
>{
>    std::cout << x::q1;        // will not link... g++ says:
>    // main.cpp:8: undefined reference to `a::b::x::q1[in-charge](int const&)'
>}

Couldn't compile without these correctiosn.

fwyzard